Abstract

In designing a fiber-optic probe to use for Raman spectral measurements in a fused salt melt at temperatures in the range 500 to 900°C, we were led to the possible use of a diamond window to aid resistance to corrosion. Diamond (space group <i>F</i>d3<i>m</i>) with 2 atoms per Bravais unit cell, possesses one triply degenerate first-order lattice phonon with symmetry, <i>F</i>_2<i>g</i>, which is Raman active. The resulting Raman line occurs at 1332 cm⁻¹ at room temperature; the line is sharp and well separated from the lower-frequency area where the Raman spectrum of other melt species would be observed. Studies of the Raman spectra of diamond as a function of temperature have previously been reported. Stokes/anti-Stokes ratio, shift, and width of the Raman spectrum of diamond have been reported by Herchen and Cappellli and by Anastassakis <i>et al.</i> These studies were carried out to better characterize the physical properties of diamond. Considering the fact that Stokes and anti-Stokes intensities could be measured concurrently with the spectra of the melt species, we thought the diamond Raman line might also be used to make an <i>in situ</i> temperature measurement for this and other systems.

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